<template>
    <div ref="pie3d" class="echartDiv"></div>
</template>

<script lang="ts" setup>
import * as echarts from 'echarts'
import 'echarts-gl'
import { nextTick, onMounted, onUnmounted, ref } from 'vue'
interface optionItem {
    name: string,
    value: number,
    label?: object,
    startRatio?: number,
    endRatio?: number,
    itemStyle?: itemStyle,
    parametricEquation?: any
}
interface itemStyle {
    color?: string | undefined,
    opacity?: number | undefined
}
const pie3d = ref(null)
let pie: any = null
const echartInit = () => {
    pie = echarts.init(pie3d.value)
    const series = getPie3D(optionsData, 0.8) //, 240, 28, 26, 0.5
    series.push({
        name: 'pie2d',
        type: 'pie',
        label: {
            opacity: 1,
            fontSize: 14,
            lineHeight: 20,
            textStyle: {
                fontSize: 14,
                color: '#fff',
            },
        },
        labelLine: {
            length: 30,
            length2: 30,
        },
        startAngle: -30, //起始角度，支持范围[0, 360]。
        clockwise: false, //饼图的扇区是否是顺时针排布。上述这两项配置主要是为了对齐3d的样式
        radius: ['40%', '60%'],
        center: ['50%', '50%'],
        data: optionsData,
        itemStyle: {
            opacity: 0,
        },
        parametric: false,
        wireframe: {
            show: false
        },
        pieData: {
            name: '',
            value: 0
        },
        pieStatus: {
            selected: false,
            hovered: false,
            k: 0
        },
        parametricEquation: {}
    })
    // 准备待返回的配置项，把准备好的 legendData、series 传入。
    let option = {
        legend: {
            show: true,
            tooltip: {
                show: true,
            },
            orient: 'vertical',
            data: ['待办', '已办', '未处理', '忽略'],
            top: 'center',
            itemGap: 14,
            itemHeight: 8,
            itemWidth: 17,
            right: '2%',
            textStyle: {
                color: '#fff',
                fontSize: 12,
            },
        },
        animation: true,
        tooltip: {
            formatter: (params: any) => {
                if (
                    params.seriesName !== 'mouseoutSeries' &&
                    params.seriesName !== 'pie2d'
                ) {
                    return `${params.seriesName
                        }<br/><span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:${params.color
                        };"></span>${option.series[params.seriesIndex].pieData.value + '人'
                        }`
                }
            },
            textStyle: {
                fontSize: 14,
            },
        },
        title: {
            x: 'center',
            top: '20',
            textStyle: {
                color: '#fff',
                fontSize: 22,
            },
        },
        backgroundColor: '#0E3567',
        labelLine: {
            show: true,
            lineStyle: {
                color: '#7BC0CB',
            },
            normal: {
                show: true,
                length: 10,
                length2: 10,
            },
        },
        label: {
            show: true,
            position: 'outside',
            formatter: '{b} \n{d}%',
            textStyle: {
                color: '#fff',
                fontSize: '14px',
            },
        },
        xAxis3D: {
            min: -1,
            max: 1,
        },
        yAxis3D: {
            min: -1,
            max: 1,
        },
        zAxis3D: {
            min: -1,
            max: 1,
        },
        grid3D: {
            show: false,
            boxHeight: 0.01,
            //top: '30%',
            bottom: '50%',
            // environment: "rgba(255,255,255,0)",
            viewControl: {
                distance: 180,
                alpha: 25,
                beta: 60,
                autoRotate: true, // 自动旋转
            },
        },
        series: series,
    }
    // 使用刚指定的配置项和数据显示图表。
    pie.setOption(option)
}
const getPie3D = (pieData: Array<optionItem>, internalDiameterRatio: number) => {
    let series = []
    let sumValue = 0
    let startValue = 0
    let endValue = 0
    let legendData = []
    let k =
        typeof internalDiameterRatio !== 'undefined'
            ? (1 - internalDiameterRatio) / (1 + internalDiameterRatio)
            : 1 / 3

    // 为每一个饼图数据，生成一个 series-surface 配置
    for (let i = 0; i < pieData.length; i++) {
        sumValue += pieData[i].value

        let seriesItem = {
            name:
                typeof pieData[i].name === 'undefined'
                    ? `series${i}`
                    : pieData[i].name,
            type: 'surface',
            label: {},
            labelLine: {},
            startAngle: 0,
            clockwise: false,
            radius: [''],
            center: [''],
            parametric: true,
            wireframe: {
                show: false,
            },
            data: {},
            pieData: pieData[i],
            pieStatus: {
                selected: false,
                hovered: false,
                k: k,
            },
            itemStyle: {},
            parametricEquation: {}
        }

        if (typeof pieData[i].itemStyle != 'undefined') {
            let itemStyle: itemStyle = { color: '', opacity: undefined }

            typeof pieData[i].itemStyle?.color != 'undefined'
                ? (itemStyle.color = pieData[i].itemStyle?.color)
                : null
            typeof pieData[i].itemStyle?.opacity != 'undefined'
                ? (itemStyle.opacity = pieData[i].itemStyle?.opacity)
                : null

            seriesItem.itemStyle = itemStyle
        }
        series.push(seriesItem)
    }

    // 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，
    // 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。
    for (let i = 0; i < series.length; i++) {
        endValue = startValue + series[i].pieData.value
        series[i].pieData.startRatio = startValue / sumValue
        series[i].pieData.endRatio = endValue / sumValue
        series[i].parametricEquation = getParametricEquation(
            series[i].pieData.startRatio || 0,
            series[i].pieData.endRatio || 0,
            false,
            false,
            k,
            series[i].pieData.value,
        )

        startValue = endValue

        legendData.push(series[i].name)
    }
    return series
}
const optionsData = [
    {
        name: '待办',
        value: 4256,
        itemStyle: {
            //   opacity: 0.5,
            color: '#2A71FF',
        },
    },

    {
        name: '已办',
        value: 2356,
        itemStyle: {
            //   opacity: 0.5,
            color: '#00EDFE',
        },
    },
    {
        name: '未处理',
        value: 2018,
        itemStyle: {
            //   opacity: 0.5,
            color: '#FEDB4B',
        },
    },
    {
        name: '忽略',
        value: 1998,
        itemStyle: {
            //   opacity: 0.5,
            color: '#FE7C2F',
        },
    },
]
const getParametricEquation = (startRatio: number,
    endRatio: number,
    isSelected: boolean,
    isHovered: boolean,
    k: number,
    height: number,) => {
    // 计算
    let midRatio = (startRatio || 0 + (endRatio || 0)) / 2

    let startRadian = (startRatio || 0) * Math.PI * 2
    let endRadian = (endRatio || 0) * Math.PI * 2
    let midRadian = midRatio * Math.PI * 2

    // 如果只有一个扇形，则不实现选中效果。
    if (startRatio === 0 && endRatio === 1) {
        isSelected = false
    }

    // 通过扇形内径/外径的值，换算出辅助参数 k（默认值 1/3）
    k = typeof k !== 'undefined' ? k : 1 / 3

    // 计算选中效果分别在 x 轴、y 轴方向上的位移（未选中，则位移均为 0）
    let offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0
    let offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0

    // 计算高亮效果的放大比例（未高亮，则比例为 1）
    let hoverRate = isHovered ? 1.05 : 1

    // 返回曲面参数方程
    return {
        u: {
            min: -Math.PI,
            max: Math.PI * 3,
            step: Math.PI / 32,
        },

        v: {
            min: 0,
            max: Math.PI * 2,
            step: Math.PI / 20,
        },

        x: function (u: number, v: number) {
            if (u < startRadian) {
                return (
                    offsetX +
                    Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate
                )
            }
            if (u > endRadian) {
                return (
                    offsetX + Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate
                )
            }
            return offsetX + Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate
        },

        y: function (u: number, v: number) {
            if (u < startRadian) {
                return (
                    offsetY +
                    Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate
                )
            }
            if (u > endRadian) {
                return (
                    offsetY + Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate
                )
            }
            return offsetY + Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate
        },

        z: function (u: number, v: number) {
            if (u < -Math.PI * 0.5) {
                return Math.sin(u)
            }
            if (u > Math.PI * 2.5) {
                return Math.sin(u)
            }
            return Math.sin(v) > 0 ? 1 * height : -1
        },
    }
}
onMounted(async () => {
    await nextTick()
    echartInit()
})
onUnmounted(() => {
    if (pie !== null && pie.dispose) {
        pie.dispose()
    }
})
</script>


<style lang='scss' scoped>
.echartDiv {
    width: 100%;
    height: 300px;
}
</style>